Without posting a huge response here, I will note that bosals and traditional hackamores are similar but by no means the same. Each is used in a different part of training the Vaquero horse, and at some points used together (at the same time). A bosal works off of nose and poll pressure mainly, as well as reins, etc.
I suggest researching Vaquero bosal training ( learn about the spade bit, which is the finished product, if you would like). Some good people to learn about are Ray Hunt and Buck Brannaman, as well as Les Vogt.
Best of luck! A horse trained the Vaquero way is a light, responsive, intelligent horse with excellent communication skills and companionship. Trained properly, a "spade horse" can be one of the most balanced, responsive horses you could ride.
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